If you have trouble finding someone, I might can help. I have a Roadblasters that seems to have a Pwr Supply issue - (bad 12V and will not boot?). I might be able to use that cab to test your board and that might help me diagnose my problem as well. I could pick it up from you next Sat when I swing by your place. If I remember right Atari Sys 1's use a ARIII, but I could be wrong.